Take deep breaths. Breathing a full, deep breath through your nose before answering each question will not only calm you by sending oxygen to your brain, but it will also give you time to think about and organize your answer. By collecting your thoughts before speaking, you will feel more confident about your answer and will be less likely to ramble.
Maintain an appropriate but comfortable posture. Don't slouch, but don't be overly rigid. If posture is normally a problem, practice a comfortable and poised position that you can maintain without pain or feeling self-conscious. If you worry about your own posture during interviews, mimic the posture of the interviewer (when appropriate) – his or her posture should communicate what is considered acceptable.
Feel free to be yourself. If you normally crack jokes, don't feel that you have to leave your sense of humor at home. You are not there to convince the interviewer that you are someone you are not (hopefully!), so be genuine and let your personality shine through. You will feel much more comfortable if you can focus on your questions and answers instead of whether you seem too shy or too bubbly.
Know how you express your nervousness. If you think about how you have acted in the past while nervous, chances are you can find a pattern in your behavior. Do you run your mouth? Do you forget what you were going to say? Do you bounce your knee? Do you sweat profusely? Then prepare to address the problem. Think about your answer before you say it, keep a hand on your knee to realize more quickly when it starts to bounce, take a dress handkerchief with you in your pocket, etc.
Remember: you are there because they want you to be! Keep that in mind when you get nervous during the interview – they were already impressed enough to invite you in for an in-depth discussion. That means you have something they want, and feeling that you have something valuable to offer them can put you at ease – the power doesn't rest solely on the other side of the interview table. So Think positively
Read more at Suite101:
Staying Calm During an Interview: Tips to Avoid being Nervous While Answering Questions
What is the organizational vision for the next five years?
Would you describe the company culture?
What are your expectations for this position?
You have been here for X amount of years – what is it about this organization that keeps you here?
Are there opportunities for internal promotion?
What projects are you working on currently?
Is your organization involved with community-based projects?
Would you describe the management style?
What types of new products or services do you see yourself offering in the future?
The Professional “Tool Kit”: More Than Meets the Eye
In your portfolio you should have the following:
Having a portfolio is about security. When most people go on an interview, they’re nervous. The portfolio helps with a lot of your nervous habits. It helps you focus more on the interview and the person who’s doing the interview. It also gives you the chance to write down any questions you might have for them. When you go to an interview with a portfolio, it shows the employee that you have interest in the company and you’re serious.